新型离子液体对苯并噻吩、二苯并噻吩的萃取性能研究  

STUDY ON THE EXTRACTION PERFORMANCE OF NEW IONIC LIQUID FOR REMOVING BENZOTHIOPHENE AND DIBENZOTHIOPHENE

作　　者：张进[1] 朴香兰[1] 朱慎林[1] 

机构地区：[1]清华大学化工系化学工程联合国家重点实验室,北京100084

出　　处：《石油炼制与化工》2008年第2期38-41,共4页Petroleum Processing and Petrochemicals

摘　　要：合成了5种新型离子液体[bmim]AlCl4,[bmin]DBP,[bmi m]BeS,[bmi m]PF6,[bmim]BF4,并将它们用于萃取模拟油品中的苯并噻吩(BT)、二苯并噻吩(DBT)。比较了5种离子液体的萃取性能,结合分子间作用力的理论和价键理论阐述了离子液体萃取脱硫的机理。结果表明,离子液体的萃取性能与其阴离子结构有关,其中[bmim]DBP适宜作萃取脱硫溶剂。BT、DBT在模拟油品中的初始含量分别为1000μg/g左右时,用[bmim]DBP经4级错流萃取和5级逆流萃取,BT、DBT含量均能降至50μg/g以下。Five kinds of ionic liquid（IL）, [bmim] AlCl4, [bmin]DBP, [bmim] BeS, [bmim]PF6, and [bmim]BF4 ,were synthesized and used to extract Benzothiophene（BT） and Dibenzothiophene（DBT） in model fuels. The desulfurization mechanism of using IL as green solvent was discussed based on intermolecular force theory and valence bond theory,and the extraction performance of the five prepared ILs was compared. Results confirmed that the removal of sulfur compounds was affected by the anion structure of IL,and [bmim]DBP was an effective solvent for removing sulfur compounds comprehensively. Model fuels, octane containing 1 000μg/g BT or 1 000 μg/g DBT,were treated with [bmim]DBP by 4 stage cross current extraction or 5 stage counter-current extraction, and the contents of BT and DBT in the model fuels could be reduced to less than 50μg/g,respectively.

关 键 词：离子液体 萃取溶剂 脱硫 

分 类 号：TQ028.32[化学工程]